Get a Docker Containers IP Address from the Host

#Introduction

Docker containers are isolated. How do you need to know each container’s IP address? Docker networking is a little complicated. Containers launched by default in the “bridge network” and allowed to communicate with another container directly. Containers added to non-default networks will be able to access each other through their alias

My example

Create a new network is devopsroles, run containers, and access the other containers using an alias as below:

docker network create devopsroles
docker run --net devopsroles  --name nginx -d nginx
docker run  --name mongodb -d mongo
docker network connect devopsroles  --alias mongohost mongodb

Get a Docker Containers IP Address from the Host

How to get IP address Docker containers from the Host OS.

docker ps
docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' name_or_id

The output terminal is as follows

[vagrant@localhost ~]$ docker ps
CONTAINER ID   IMAGE     COMMAND                  CREATED         STATUS              PORTS       NAMES
fc0c94f5ef9d   mongo     "docker-entrypoint.s…"   3 minutes ago   Up 3 minutes        27017/tcp   mongodb
a2b21fffc9d8   nginx     "/docker-entrypoint.…"   6 hours ago     Up About a minute   80/tcp      nginx
[vagrant@localhost ~]$ docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' fc0c94f5ef9d
172.17.0.2172.18.0.2
[vagrant@localhost ~]$ docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' a2b21fffc9d8
172.18.0.3
[vagrant@localhost ~]$

You can use the docker network inspect command to print all containers in the given network.

docker network inspect bridge -f '{{json .Containers}}'

Get network config from the containers

docker exec -it container_name_Or_ID ip a

Conclusion

You have to Get a Docker Containers IP Address from the Host. I hope will this your helpful. Thank you for reading the DevopsRoles page!